Big Brown/redish Spot After CO2 Laser? (photo)

I am having a big brown/redish spot in the left side of my face wich remains for 4 months after a laser CO2 treatment to remove a small sign. I´ve been applying clairial C10 in the morning and Clairial Peel in the night for one month and no results untill now. I´m also using a sun protection cream avene for sensitive skin. What shell I do? Many thanks for any help.